(!!!) (PAIR) 6HF5 Sylvania NOS 1970's (96ma and 97ma)
By Tube World
$ 74.99
1 pair) 6HF5 Sylvania NOS 1970's - same plate shape - slightly different internals
1 tube) 96ma Gm=10,600
1 tube) 97ma Gm=9800 larger heat sink attached to plate - faded printing
Tested on Amplitrex
Vplate=175V
Vscreen=125V
Vgrid=-25V
Good Ma range 90-125ma
Good Gm = 9,000 - 11,000
- Diathermy machine built by Mettler Electronics
See more: vacuum tube
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 (PAIR) 6HF5 Sylvania NOS 1970's (96ma and 97ma) "Pin It")